linux/arch/arm64/mm/numa.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * NUMA support, based on the x86 implementation.
   4 *
   5 * Copyright (C) 2015 Cavium Inc.
   6 * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
   7 */
   8
   9#define pr_fmt(fmt) "NUMA: " fmt
  10
  11#include <linux/acpi.h>
  12#include <linux/memblock.h>
  13#include <linux/module.h>
  14#include <linux/of.h>
  15
  16#include <asm/acpi.h>
  17#include <asm/sections.h>
  18
  19struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  20EXPORT_SYMBOL(node_data);
  21nodemask_t numa_nodes_parsed __initdata;
  22static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
  23
  24static int numa_distance_cnt;
  25static u8 *numa_distance;
  26bool numa_off;
  27
  28static __init int numa_parse_early_param(char *opt)
  29{
  30        if (!opt)
  31                return -EINVAL;
  32        if (str_has_prefix(opt, "off"))
  33                numa_off = true;
  34
  35        return 0;
  36}
  37early_param("numa", numa_parse_early_param);
  38
  39cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
  40EXPORT_SYMBOL(node_to_cpumask_map);
  41
  42#ifdef CONFIG_DEBUG_PER_CPU_MAPS
  43
  44/*
  45 * Returns a pointer to the bitmask of CPUs on Node 'node'.
  46 */
  47const struct cpumask *cpumask_of_node(int node)
  48{
  49        if (WARN_ON(node >= nr_node_ids))
  50                return cpu_none_mask;
  51
  52        if (WARN_ON(node_to_cpumask_map[node] == NULL))
  53                return cpu_online_mask;
  54
  55        return node_to_cpumask_map[node];
  56}
  57EXPORT_SYMBOL(cpumask_of_node);
  58
  59#endif
  60
  61static void numa_update_cpu(unsigned int cpu, bool remove)
  62{
  63        int nid = cpu_to_node(cpu);
  64
  65        if (nid == NUMA_NO_NODE)
  66                return;
  67
  68        if (remove)
  69                cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]);
  70        else
  71                cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
  72}
  73
  74void numa_add_cpu(unsigned int cpu)
  75{
  76        numa_update_cpu(cpu, false);
  77}
  78
  79void numa_remove_cpu(unsigned int cpu)
  80{
  81        numa_update_cpu(cpu, true);
  82}
  83
  84void numa_clear_node(unsigned int cpu)
  85{
  86        numa_remove_cpu(cpu);
  87        set_cpu_numa_node(cpu, NUMA_NO_NODE);
  88}
  89
  90/*
  91 * Allocate node_to_cpumask_map based on number of available nodes
  92 * Requires node_possible_map to be valid.
  93 *
  94 * Note: cpumask_of_node() is not valid until after this is done.
  95 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
  96 */
  97static void __init setup_node_to_cpumask_map(void)
  98{
  99        int node;
 100
 101        /* setup nr_node_ids if not done yet */
 102        if (nr_node_ids == MAX_NUMNODES)
 103                setup_nr_node_ids();
 104
 105        /* allocate and clear the mapping */
 106        for (node = 0; node < nr_node_ids; node++) {
 107                alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
 108                cpumask_clear(node_to_cpumask_map[node]);
 109        }
 110
 111        /* cpumask_of_node() will now work */
 112        pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
 113}
 114
 115/*
 116 * Set the cpu to node and mem mapping
 117 */
 118void numa_store_cpu_info(unsigned int cpu)
 119{
 120        set_cpu_numa_node(cpu, cpu_to_node_map[cpu]);
 121}
 122
 123void __init early_map_cpu_to_node(unsigned int cpu, int nid)
 124{
 125        /* fallback to node 0 */
 126        if (nid < 0 || nid >= MAX_NUMNODES || numa_off)
 127                nid = 0;
 128
 129        cpu_to_node_map[cpu] = nid;
 130
 131        /*
 132         * We should set the numa node of cpu0 as soon as possible, because it
 133         * has already been set up online before. cpu_to_node(0) will soon be
 134         * called.
 135         */
 136        if (!cpu)
 137                set_cpu_numa_node(cpu, nid);
 138}
 139
 140#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
 141unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
 142EXPORT_SYMBOL(__per_cpu_offset);
 143
 144static int __init early_cpu_to_node(int cpu)
 145{
 146        return cpu_to_node_map[cpu];
 147}
 148
 149static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
 150{
 151        return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
 152}
 153
 154static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size,
 155                                       size_t align)
 156{
 157        int nid = early_cpu_to_node(cpu);
 158
 159        return  memblock_alloc_try_nid(size, align,
 160                        __pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, nid);
 161}
 162
 163static void __init pcpu_fc_free(void *ptr, size_t size)
 164{
 165        memblock_free_early(__pa(ptr), size);
 166}
 167
 168void __init setup_per_cpu_areas(void)
 169{
 170        unsigned long delta;
 171        unsigned int cpu;
 172        int rc;
 173
 174        /*
 175         * Always reserve area for module percpu variables.  That's
 176         * what the legacy allocator did.
 177         */
 178        rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
 179                                    PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
 180                                    pcpu_cpu_distance,
 181                                    pcpu_fc_alloc, pcpu_fc_free);
 182        if (rc < 0)
 183                panic("Failed to initialize percpu areas.");
 184
 185        delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
 186        for_each_possible_cpu(cpu)
 187                __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
 188}
 189#endif
 190
 191/**
 192 * numa_add_memblk() - Set node id to memblk
 193 * @nid: NUMA node ID of the new memblk
 194 * @start: Start address of the new memblk
 195 * @end:  End address of the new memblk
 196 *
 197 * RETURNS:
 198 * 0 on success, -errno on failure.
 199 */
 200int __init numa_add_memblk(int nid, u64 start, u64 end)
 201{
 202        int ret;
 203
 204        ret = memblock_set_node(start, (end - start), &memblock.memory, nid);
 205        if (ret < 0) {
 206                pr_err("memblock [0x%llx - 0x%llx] failed to add on node %d\n",
 207                        start, (end - 1), nid);
 208                return ret;
 209        }
 210
 211        node_set(nid, numa_nodes_parsed);
 212        return ret;
 213}
 214
 215/*
 216 * Initialize NODE_DATA for a node on the local memory
 217 */
 218static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
 219{
 220        const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
 221        u64 nd_pa;
 222        void *nd;
 223        int tnid;
 224
 225        if (start_pfn >= end_pfn)
 226                pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
 227
 228        nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
 229        if (!nd_pa)
 230                panic("Cannot allocate %zu bytes for node %d data\n",
 231                      nd_size, nid);
 232
 233        nd = __va(nd_pa);
 234
 235        /* report and initialize */
 236        pr_info("NODE_DATA [mem %#010Lx-%#010Lx]\n",
 237                nd_pa, nd_pa + nd_size - 1);
 238        tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
 239        if (tnid != nid)
 240                pr_info("NODE_DATA(%d) on node %d\n", nid, tnid);
 241
 242        node_data[nid] = nd;
 243        memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
 244        NODE_DATA(nid)->node_id = nid;
 245        NODE_DATA(nid)->node_start_pfn = start_pfn;
 246        NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
 247}
 248
 249/*
 250 * numa_free_distance
 251 *
 252 * The current table is freed.
 253 */
 254void __init numa_free_distance(void)
 255{
 256        size_t size;
 257
 258        if (!numa_distance)
 259                return;
 260
 261        size = numa_distance_cnt * numa_distance_cnt *
 262                sizeof(numa_distance[0]);
 263
 264        memblock_free(__pa(numa_distance), size);
 265        numa_distance_cnt = 0;
 266        numa_distance = NULL;
 267}
 268
 269/*
 270 * Create a new NUMA distance table.
 271 */
 272static int __init numa_alloc_distance(void)
 273{
 274        size_t size;
 275        u64 phys;
 276        int i, j;
 277
 278        size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]);
 279        phys = memblock_find_in_range(0, PFN_PHYS(max_pfn),
 280                                      size, PAGE_SIZE);
 281        if (WARN_ON(!phys))
 282                return -ENOMEM;
 283
 284        memblock_reserve(phys, size);
 285
 286        numa_distance = __va(phys);
 287        numa_distance_cnt = nr_node_ids;
 288
 289        /* fill with the default distances */
 290        for (i = 0; i < numa_distance_cnt; i++)
 291                for (j = 0; j < numa_distance_cnt; j++)
 292                        numa_distance[i * numa_distance_cnt + j] = i == j ?
 293                                LOCAL_DISTANCE : REMOTE_DISTANCE;
 294
 295        pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt);
 296
 297        return 0;
 298}
 299
 300/**
 301 * numa_set_distance() - Set inter node NUMA distance from node to node.
 302 * @from: the 'from' node to set distance
 303 * @to: the 'to'  node to set distance
 304 * @distance: NUMA distance
 305 *
 306 * Set the distance from node @from to @to to @distance.
 307 * If distance table doesn't exist, a warning is printed.
 308 *
 309 * If @from or @to is higher than the highest known node or lower than zero
 310 * or @distance doesn't make sense, the call is ignored.
 311 */
 312void __init numa_set_distance(int from, int to, int distance)
 313{
 314        if (!numa_distance) {
 315                pr_warn_once("Warning: distance table not allocated yet\n");
 316                return;
 317        }
 318
 319        if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
 320                        from < 0 || to < 0) {
 321                pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
 322                            from, to, distance);
 323                return;
 324        }
 325
 326        if ((u8)distance != distance ||
 327            (from == to && distance != LOCAL_DISTANCE)) {
 328                pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
 329                             from, to, distance);
 330                return;
 331        }
 332
 333        numa_distance[from * numa_distance_cnt + to] = distance;
 334}
 335
 336/*
 337 * Return NUMA distance @from to @to
 338 */
 339int __node_distance(int from, int to)
 340{
 341        if (from >= numa_distance_cnt || to >= numa_distance_cnt)
 342                return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
 343        return numa_distance[from * numa_distance_cnt + to];
 344}
 345EXPORT_SYMBOL(__node_distance);
 346
 347static int __init numa_register_nodes(void)
 348{
 349        int nid;
 350        struct memblock_region *mblk;
 351
 352        /* Check that valid nid is set to memblks */
 353        for_each_memblock(memory, mblk)
 354                if (mblk->nid == NUMA_NO_NODE || mblk->nid >= MAX_NUMNODES) {
 355                        pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
 356                                mblk->nid, mblk->base,
 357                                mblk->base + mblk->size - 1);
 358                        return -EINVAL;
 359                }
 360
 361        /* Finally register nodes. */
 362        for_each_node_mask(nid, numa_nodes_parsed) {
 363                unsigned long start_pfn, end_pfn;
 364
 365                get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
 366                setup_node_data(nid, start_pfn, end_pfn);
 367                node_set_online(nid);
 368        }
 369
 370        /* Setup online nodes to actual nodes*/
 371        node_possible_map = numa_nodes_parsed;
 372
 373        return 0;
 374}
 375
 376static int __init numa_init(int (*init_func)(void))
 377{
 378        int ret;
 379
 380        nodes_clear(numa_nodes_parsed);
 381        nodes_clear(node_possible_map);
 382        nodes_clear(node_online_map);
 383
 384        ret = numa_alloc_distance();
 385        if (ret < 0)
 386                return ret;
 387
 388        ret = init_func();
 389        if (ret < 0)
 390                goto out_free_distance;
 391
 392        if (nodes_empty(numa_nodes_parsed)) {
 393                pr_info("No NUMA configuration found\n");
 394                ret = -EINVAL;
 395                goto out_free_distance;
 396        }
 397
 398        ret = numa_register_nodes();
 399        if (ret < 0)
 400                goto out_free_distance;
 401
 402        setup_node_to_cpumask_map();
 403
 404        return 0;
 405out_free_distance:
 406        numa_free_distance();
 407        return ret;
 408}
 409
 410/**
 411 * dummy_numa_init() - Fallback dummy NUMA init
 412 *
 413 * Used if there's no underlying NUMA architecture, NUMA initialization
 414 * fails, or NUMA is disabled on the command line.
 415 *
 416 * Must online at least one node (node 0) and add memory blocks that cover all
 417 * allowed memory. It is unlikely that this function fails.
 418 *
 419 * Return: 0 on success, -errno on failure.
 420 */
 421static int __init dummy_numa_init(void)
 422{
 423        int ret;
 424        struct memblock_region *mblk;
 425
 426        if (numa_off)
 427                pr_info("NUMA disabled\n"); /* Forced off on command line. */
 428        pr_info("Faking a node at [mem %#018Lx-%#018Lx]\n",
 429                memblock_start_of_DRAM(), memblock_end_of_DRAM() - 1);
 430
 431        for_each_memblock(memory, mblk) {
 432                ret = numa_add_memblk(0, mblk->base, mblk->base + mblk->size);
 433                if (!ret)
 434                        continue;
 435
 436                pr_err("NUMA init failed\n");
 437                return ret;
 438        }
 439
 440        numa_off = true;
 441        return 0;
 442}
 443
 444/**
 445 * arm64_numa_init() - Initialize NUMA
 446 *
 447 * Try each configured NUMA initialization method until one succeeds. The
 448 * last fallback is dummy single node config encomapssing whole memory.
 449 */
 450void __init arm64_numa_init(void)
 451{
 452        if (!numa_off) {
 453                if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))
 454                        return;
 455                if (acpi_disabled && !numa_init(of_numa_init))
 456                        return;
 457        }
 458
 459        numa_init(dummy_numa_init);
 460}
 461
 462/*
 463 * We hope that we will be hotplugging memory on nodes we already know about,
 464 * such that acpi_get_node() succeeds and we never fall back to this...
 465 */
 466int memory_add_physaddr_to_nid(u64 addr)
 467{
 468        pr_warn("Unknown node for memory at 0x%llx, assuming node 0\n", addr);
 469        return 0;
 470}
 471